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Old 05-24-2013, 03:07 PM   #21
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Had a 2001 Duramax, 3/4 ton crew cab 4x4 that got 14 pulling my 36 ft toyhauler 5er and my present 35 ft 5er. My 2011 duramax 1 ton dually, crew cab, 4x4 pulling the 5er gets between 9.5 and 12 depending on wind and terrain. It gets close to 2o mpg at 65 mph not towing. The 3/4 ton got 24 highway, 20 city........
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Old 05-24-2013, 04:23 PM   #22
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11 mpg pulling my 11k 5er

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Old 05-24-2013, 04:57 PM   #23
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I am still judging mine, but so far it looks like 12-15 towing. Depending on terrain. Cruise control about 62 mph. rpm between 1500-1800
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Old 05-24-2013, 05:01 PM   #24
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Thanks for the replys guys! I am going to forward him a link to this. He bought the truck from the dealership that sold it new and also did all the service work on it, he said that they dealer did a full service of all the fluids and filters before he bought it, but who knows what that actually means...

I know he wasn't towing with a lead foot, as I was right behind him the whole time. Except for hill that is about a mile long where I kicked the cruise off so mine would stay in 3rd and not kick to second gear and scream up the hill. But he walked right up the hill like nothing, which is the strange thing, the truck seems to have all the power it should but its just that the mileage sucks!

Hopefully we/he can figure out what is going on with his truck. When my 2004 F150 FX4, 5.4L with a small lift and bigger tires gets better mileage (both towing and empty) that a basically stock modern day diesel, something is not right.
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Old 05-25-2013, 08:08 AM   #25
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I have a 2012 gmc 2500 that gets 22 highway and 14 when towing a v cross 5th wheel
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Old 05-25-2013, 08:53 AM   #26
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had an 05 1500hd with the 6.0, and the mileage sucked. nice truck, but towing I was at seeing about 8 with 8500lb tt. 08 dmax cc 2wd towing went to 12 with same trailer and has been getting the same with 13000 lb 5vr. 15 around town, 20 hiway when empty at 70. dmax (or any diesel) are not around town trucks.
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Old 05-25-2013, 12:36 PM   #27
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My 8.1 gets about 13mpg empty
8mpg towing 6,000lb camper
8mpg in town.

She's a thirsty beast.....
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Old 05-25-2013, 12:42 PM   #28
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Quote:
Originally Posted by dwaynerz View Post
had an 05 1500hd with the 6.0, and the mileage sucked. nice truck, but towing I was at seeing about 8 with 8500lb tt. 08 dmax cc 2wd towing went to 12 with same trailer and has been getting the same with 13000 lb 5vr. 15 around town, 20 hiway when empty at 70. dmax (or any diesel) are not around town trucks.
I agree. You don't buy these trucks for gas mileage, bought for towing. Good gas mileage a bonus.
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Old 05-25-2013, 01:21 PM   #29
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I have an '06 2500HD CC/SB 4wd Duramax / Allison. I get between 9 and 10 mpg towing a Columbus 320RS, depending on wind, terrain, etc. I usually have cruise set around 65 on Interstate. You can get better mileage at 55, but I don't like to go that slow when everyone else is going 75 or more. I have gotten as high as 18 mpg highway not towing. I get about 7 mpg around town, which is why it sits in the driveway most of time when we are home.

For reference, I had a '99 Suburban 2500 4wd with 7.4L gas engine before this. I would get 7 - 8 MPG towing a 10,000 lb TT. When I traded for the Duramax truck, mileage went up to 12MPG with the same TT, and the Duramax / Allison towed effortlessly; thought I had died and gone to heaven. When we got our first 5er, a 40 foot SandPiper, mileage dropped to around 10. But towing a large 5er is like dragging a sailboat down the road, sideways. Lots of resistance!
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Old 05-25-2013, 01:43 PM   #30
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I had the same transition. 03 suburban 2500 towing 30 ft TH, to 3500 Duramax towing 37 ft 5er. Night and day. Especially coming through the mountains.
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